Microwave oven



FIG. 1 is a front elevation view of a microwave oven showing my new design;

FIG. 2 is a left side elevation view thereof;

FIG. 3 is a right side elevation view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a front perspective view thereof.

Broken lines form no part of the claimed design. 

CLAIM The ornamental design for a microwave oven, as shown and described. 